/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
Register for when an attribute value changes, should be replaced by GetGameplayAttributeValueChangeDelegate
[FOnGameplayAttributeChange](API\Plugins\GameplayAbilities\FOnGameplayAttributeChange) & RegisterGameplayAttributeEvent ( [FGameplayAttribute](API\Plugins\GameplayAbilities\FGameplayAttribute) Attribute )